What does an exclamation mark mean in the Swift language?
The Swift Programming Language guide has the following example: class Person { let name: String init(name: String) { self.name = name } var apartment: Apartment? deinit { println(“\(name) is being deinitialized”) } } class Apartment { let number: Int init(number: Int) { self.number = number } var tenant: Person? deinit { println(“Apartment #\(number) is being … Read more
